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Free Birth Chart Calculator
See your Sun, Moon and rising sign, where every planet sits by sign and house, and the aspects that tie them together, all on your own chart wheel.
The basics
What is a birth chart?
A birth chart, also called a natal chart, is a map of the sky at the exact moment and place you were born. It shows where the Sun, Moon and planets were in the zodiac and the angles they made to each other. Astrologers read it as a blueprint of your personality: what drives you, what you need, how you love and where you’re headed.
Your Sun sign, the one you read horoscopes for, is just one point on that map. The rest of your chart is why two people with the same Sun sign can be completely different.
Before you start
What you need to calculate your birth chart
- 1Your birth dateThis sets where the Sun and every planet were.
- 2Your birth timeAs exact as you can get it. It decides your rising sign and houses, which shift every few minutes. Your birth certificate is the best source.
- 3Your birth cityIt sets your time zone, including the daylight saving rules for your birth year, and your place on Earth.
Don’t know your birth time?
You’ll still get your Sun sign and the sign of every planet. The Moon moves about 13 degrees a day, so on some birthdays it changes signs; when that happens, the calculator shows you both options. Your rising sign and houses need a birth time, so try your birth certificate, a baby book or a parent’s memory, then come back and add it.
Start here
Your Big Three: Sun, Moon and rising
Most astrologers read these three placements first. Together they sketch the outline of who you are.
- ☉︎Sun signYour core identity and what you’re here to do. It’s the engine of your personality.
- ☽︎Moon signYour emotional needs, your instincts and what makes you feel safe. People who know you well usually know your Moon.
- ↑︎Rising signHow you come across and meet the world. It’s the sign rising on the eastern horizon when you were born, and it sets up every house in your chart.
The cast
The planets in your birth chart
Each planet is a different part of you. Its sign shows how that part works, and its house shows where in your life it plays out.
- ☿︎MercuryHow you think, learn and talk.
- ♀︎VenusHow you love, what you find beautiful and what you value.
- ♂︎MarsYour drive, your desire and how you fight.
- ♃︎JupiterWhere you grow, get lucky and want more.
- ♄︎SaturnDiscipline, limits and the lessons you can’t skip.
- ♅︎UranusWhere you break the rules and need your freedom.
- ♆︎NeptuneWhere you dream, idealize and sometimes get lost.
- ♇︎PlutoPower, intensity and the places you transform completely.
The stage
The 12 houses
If planets are the what and signs are the how, houses are the where: the area of life each planet acts in. A house holding several planets is a part of life that takes up a lot of your energy.
- 11st houseYou, your body and first impressions
- 22nd houseMoney, possessions and self-worth
- 33rd houseCommunication, siblings and your neighborhood
- 44th houseHome, family and roots
- 55th houseRomance, creativity, fun and children
- 66th houseWork, routines and health
- 77th housePartnership and marriage
- 88th houseIntimacy, shared money and transformation
- 99th houseTravel, beliefs and higher learning
- 1010th houseCareer and reputation
- 1111th houseFriends, community and your hopes
- 1212th houseRest, secrets and the subconscious
The conversation
Aspects: how your planets talk to each other
Aspects are the angles between planets. They show which parts of you work together and which ones argue. The orb is how far an aspect is from exact: the smaller the orb, the louder it is in your life. Your calculated chart links each aspect to our natal aspect guides, like Venus trine Mars or Saturn opposite Moon.
- ☌︎Conjunction · 0°Two planets blend and act as one.
- ⚹︎Sextile · 60°An easy opening you have to choose to use.
- □︎Square · 90°Friction that pushes you to grow.
- △︎Trine · 120°Natural talent and easy flow.
- ☍︎Opposition · 180°A tug of war you learn to balance, often played out with other people.
Reading it
How to read your birth chart
- 1Start with your Big ThreeSun, Moon and rising give you the outline before the details.
- 2Find your chart rulerThe planet that rules your rising sign (Mars for Aries rising, Venus for Taurus or Libra rising) has extra say in your whole chart.
- 3Look for crowdsHouses and signs where planets cluster are where your life concentrates.
- 4Read your tightest aspectsAspects with orbs under 2° are some of the most noticeable themes in a chart.
Go deeper
Your chart never changes. The sky does.
Every day the planets land somewhere new in your chart. SASS Insider sends you a horoscope written for your exact chart every morning, plus SASS Chat, an AI astrologer you can ask about any placement, aspect or transit. It’s $50 a year.
Questions
Birth chart FAQ
Is this birth chart calculator really free?
Yes. There is no signup and no email required. Enter your birth date, time and city and your full chart appears on the page.
How accurate is this birth chart?
The positions come from the Swiss Ephemeris, the same astronomical data professional astrology software uses. Your chart is only as accurate as your birth time, though: being off by even 15 minutes can change your rising sign or move a planet into a different house.
What house system do you use?
Placidus, the most widely used house system in Western astrology. For births very far north or south, where Placidus breaks down, the chart switches to Equal houses.
What if I don’t know my birth time?
Tick “I don’t know my birth time” and you will still get your Sun sign, almost always your Moon sign, and the sign of every planet. Your rising sign and houses need a birth time, so they are left out rather than guessed.
What is the difference between a birth chart and a horoscope?
Your birth chart is fixed: it is the sky at the moment you were born. A horoscope describes how the planets moving today interact with that chart. Sun sign horoscopes use only your Sun sign, while a personal horoscope uses your whole chart.
Do I need to calculate my chart again next time?
No. Your chart is saved in this browser, so it is here when you come back. Your natal chart never changes, so you only need to calculate it once.